Well there's the stuff that's good for the rest of the universe, and the stuff that's good for the Immortals. Obviously what's good for the Immortals is a greater good than what's good for the rest of the universe.

According to Wikipedia, it's due to intravenous drug use, burns or crushing damage.

I also don't know if Scotland's healthcare system is as good as Canada's, so maybe we could all donate 10% of our income to Warhead, which would pay for his flight to America and part of his medical bill. Otherwise they're going to have to chop off his legs like they did with IVHorseman.